package com.itheima.filter;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;

import java.io.IOException;

//@WebFilter(urlPatterns = "/*")
public class DemoFilter implements Filter {
    @Override   //初始化方法，只执行一次
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init 初始化方法执行了");
    }

    @Override   //拦截到请求之后调用，调用多次
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("Demo 拦截到了请求...放行前的逻辑");

        //放行操作
        filterChain.doFilter(servletRequest, servletResponse);

         System.out.println("Demo 拦截到了请求...放行后的逻辑");
    }

    @Override   //销毁方法，只执行一次
    public void destroy() {
        System.out.println("destroy 销毁方法执行了");
    }
}
